Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8c90d065e9f31c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 10:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c21bb40292cdba7ad6a60d6c961039db SHA-1: c2b36a6456911b950ed8361e057a5dc06499a0a8 SHA-256: 8f8c90d065e9f31cd595975da7e34661de0242257200f789247165ab1d79d82d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The primary URL points to a PDF file hosted on a domain that appears to be part of a link farm, suggesting a distribution or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jewelry-shopping-city.com/uploads/files/202109240618448188.pdf In PDF document text
    • http://snap-drone.com/userfiles/file/99549837599.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/kuteped.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/wudoferevesabojotijubed.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/43656298644.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/92325344509.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/45920571890.pdfIn PDF document text
    • http://195exim.com/datas/files/56228102252.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/62470432508.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///51165834796.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/penivutigolewokoki.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/rugoxabolo.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/wibularoxi.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/80421028421.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8ed38c50---88959128121.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/10270797590.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/76534956112.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gejadufobalaxedaje.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/48605061942.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210921091049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sideload+an+appPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB74 10092 bytes
SHA-256: 2a8e0e975e5defa256b4f5040bc10bb1eca6b28e584baf00f99de18b4669ff6d
font_01_sfnt_off0000c1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F9 16936 bytes
SHA-256: 705cc7be20957f54b8d1e22a987d844f4d93c19d7e136311fae74240e156b191
font_02_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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